问题
After installing Xamarin Forms Map, I am now getting this. I've tried to remove everything I added (the init, changes to the Manifest, etc). Gone from a working solution to a broken one that won't even compile.
Appreciate any suggestions
Tried to install current version of Xamarin.Forms.Map : 2.3.3.180
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets (_GenerateJavaStubs target) ->
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets: warning : Duplicate managed type found! Mappings between managed types and Java types must be unique. First Type: 'Android.Support.V4.OS.CancellationSignal+IOnCancelListenerImplementor, Xamarin.Android.Support.v4, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'; Second Type: 'Android.Support.V4.OS.CancellationSignal+IOnCancelListenerImplementor, Xamarin.Android.Support.Compat, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'.
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets: warning : References to the type 'Android.Support.V4.OS.CancellationSignal.IOnCancelListenerImplementor' will refer to 'Android.Support.V4.OS.CancellationSignal+IOnCancelListenerImplementor, Xamarin.Android.Support.v4, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'.
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets: warning : Duplicate managed type found! Mappings between managed types and Java types must be unique. First Type: 'Android.Support.V4.View.ActionProvider+ISubUiVisibilityListenerImplementor, Xamarin.Android.Support.v4, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'; Second Type: 'Android.Support.V4.View.ActionProvider+ISubUiVisibilityListenerImplementor, Xamarin.Android.Support.Compat, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'.
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets: warning : References to the type 'Android.Support.V4.View.ActionProvider.ISubUiVisibilityListenerImplementor' will refer to 'Android.Support.V4.View.ActionProvider+ISubUiVisibilityListenerImplementor, Xamarin.Android.Support.v4, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'.
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets: warning : Duplicate managed type found! Mappings between managed types and Java types must be unique. First Type: 'Android.Support.V4.View.ActionProvider+IVisibilityListenerImplementor, Xamarin.Android.Support.v4, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'; Second Type: 'Android.Support.V4.View.ActionProvider+IVisibilityListenerImplementor, Xamarin.Android.Support.Compat, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'.
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets: warning : References to the type 'Android.Support.V4.View.ActionProvider.IVisibilityListenerImplementor' will refer to 'Android.Support.V4.View.ActionProvider+IVisibilityListenerImplementor, Xamarin.Android.Support.v4, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'.
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets: warning : Duplicate managed type found! Mappings between managed types and Java types must be unique. First Type: 'Android.Support.V4.View.IOnApplyWindowInsetsListenerImplementor, Xamarin.Android.Support.v4, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'; Second Type: 'Android.Support.V4.View.IOnApplyWindowInsetsListenerImplementor, Xamarin.Android.Support.Compat, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'.
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets: warning : References to the type 'Android.Support.V4.View.IOnApplyWindowInsetsListenerImplementor' will refer to 'Android.Support.V4.View.IOnApplyWindowInsetsListenerImplementor, Xamarin.Android.Support.v4, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'.
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets: warning : Duplicate managed type found! Mappings between managed types and Java types must be unique. First Type: 'Android.Support.V4.View.IViewPropertyAnimatorListenerImplementor, Xamarin.Android.Support.v4, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'; Second Type: 'Android.Support.V4.View.IViewPropertyAnimatorListenerImplementor, Xamarin.Android.Support.Compat, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'.
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets: warning : References to the type 'Android.Support.V4.View.IViewPropertyAnimatorListenerImplementor' will refer to 'Android.Support.V4.View.IViewPropertyAnimatorListenerImplementor, Xamarin.Android.Support.v4, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'.
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets: warning : Duplicate managed type found! Mappings between managed types and Java types must be unique. First Type: 'Android.Support.V4.View.IViewPropertyAnimatorUpdateListenerImplementor, Xamarin.Android.Support.v4, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'; Second Type: 'Android.Support.V4.View.IViewPropertyAnimatorUpdateListenerImplementor, Xamarin.Android.Support.Compat, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'.
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets: warning : References to the type 'Android.Support.V4.View.IViewPropertyAnimatorUpdateListenerImplementor' will refer to 'Android.Support.V4.View.IViewPropertyAnimatorUpdateListenerImplementor, Xamarin.Android.Support.v4, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'.
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets: warning : Duplicate managed type found! Mappings between managed types and Java types must be unique. First Type: 'Android.Support.V4.View.MenuItemCompat+IOnActionExpandListenerImplementor, Xamarin.Android.Support.v4, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'; Second Type: 'Android.Support.V4.View.MenuItemCompat+IOnActionExpandListenerImplementor, Xamarin.Android.Support.Compat, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'.
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets: warning : References to the type 'Android.Support.V4.View.MenuItemCompat.IOnActionExpandListenerImplementor' will refer to 'Android.Support.V4.View.MenuItemCompat+IOnActionExpandListenerImplementor, Xamarin.Android.Support.v4, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'.
Errors:
/Users/TESTProjects/TEST/Droid/TEST.Droid.csproj (Build) ->
/Library/Frameworks/Mono.framework/External/xbuild/Xamarin/Android/Xamarin.Android.Common.targets (_CompileJava target) ->
obj/Debug/android/src/mono/android/support/v4/app/SharedElementCallback_OnSharedElementsReadyListenerImplementor.java(8,47): javacerror : error: cannot find symbol
android.support.v4.app.SharedElementCallback.OnSharedElementsReadyListener
symbol: class OnSharedElementsReadyListener
location: class SharedElementCallback
obj/Debug/android/src/mono/android/support/v4/view/accessibility/AccessibilityManagerCompat_AccessibilityStateChangeListenerImplementor.java(8,67): javacerror : error: cannot find symbol
android.support.v4.view.accessibility.AccessibilityManagerCompat.AccessibilityStateChangeListener
symbol: class AccessibilityStateChangeListener
location: class AccessibilityManagerCompat
obj/Debug/android/src/mono/android/support/v4/view/accessibility/AccessibilityManagerCompat_TouchExplorationStateChangeListenerImplementor.java(8,67): javacerror : error: cannot find symbol
android.support.v4.view.accessibility.AccessibilityManagerCompat.TouchExplorationStateChangeListener
symbol: class TouchExplorationStateChangeListener
location: class AccessibilityManagerCompat
obj/Debug/android/src/mono/android/support/v4/widget/SearchViewCompat_OnCloseListenerImplementor.java(8,45): javacerror : error: cannot find symbol
android.support.v4.widget.SearchViewCompat.OnCloseListener
symbol: class OnCloseListener
location: class SearchViewCompat
obj/Debug/android/src/mono/android/support/v4/widget/SearchViewCompat_OnQueryTextListenerImplementor.java(8,45): error : error: cannot find symbol
android.support.v4.widget.SearchViewCompat.OnQueryTextListener
symbol: class OnQueryTextListener
location: class SearchViewCompat
回答1:
I've ran into the same problem today, which seems to be related to two different dependencies from two C# projects of which one is used/referenced by the other. From what I see, there may be two different versions of the same dependency installed. Most likely, you might need to consolidate your NuGet packages. This might be what the error message is trying to say. One of the duplicated types is Android.Support.V4.View.IViewPropertyAnimatorListenerImplementor which is contained within the two libraries Xamarin.Android.Support.v4 and Xamarin.Android.Support.Compat.
At least for my solution this is due to two different versions of the Xamarin.Android.Support.v4 NuGet package, namely versions 25.3.1 and 23.3.0. Because of the dependencies of the Xamarin.Forms NuGet package, I explicitly had to downgrade to version 23.3.0 which seems to solve the problem.
来源：https://stackoverflow.com/questions/41710697/xamarin-forms-how-to-fix-broken-build-seems-like-formsmap-broke-it